1121999953 has 2 divisors, whose sum is σ = 1121999954. Its totient is φ = 1121999952.

The previous prime is 1121999947. The next prime is 1121999969. The reversal of 1121999953 is 3599991211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 836829184 + 285170769 = 28928^2 + 16887^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121999953 - 2⁹ = 1121999441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121999897 and 1121999906.

It is not a weakly prime, because it can be changed into another prime (1121999993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560999976 + 560999977.

It is an arithmetic number, because the mean of its divisors is an integer number (560999977).

Almost surely, 2^1121999953 is an apocalyptic number.

It is an amenable number.

1121999953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121999953 is an equidigital number, since it uses as much as digits as its factorization.

1121999953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196830, while the sum is 49.

The square root of 1121999953 is about 33496.2677473178. The cubic root of 1121999953 is about 1039.1165923364.

The spelling of 1121999953 in words is "one billion, one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred fifty-three".